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UC3842 Datasheet(PDF) 1 Page - NXP Semiconductors

Part No. UC3842
Description  Current-mode PWM controller
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Maker  PHILIPS [NXP Semiconductors]
Homepage  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

UC3842 Datasheet(HTML) 1 Page - NXP Semiconductors

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Philips Semiconductors Linear Products
Product specification
UC3842
Current-mode PWM controller
1100
August 31, 1994
853-0614 13721
DESCRIPTION
The UC3842 is available in an 8-Pin mini-DIP the necessary
features to implement off-line, fixed-frequency current-mode control
schemes with a minimal external parts count. This technique results
in improved line regulation, enhanced load response characteristics,
and a simpler, easier to design control loop. Topological advantages
include inherent pulse-by-pulse current limiting.
Protection circuitry includes built-in undervoltage lock-out and
current limiting. Other features include fully-latched operation, a 1%
trimmed bandgap reference, and start-up current less than 1mA.
These devices feature a totem-pole output designed to source and
sink high peak current from a capacitive load, such as the gate of a
power MOSFET. Consistent with N-channel power devices, the
output is low in the OFF-state.
FEATURES
Low start-up current (≤1mA)
Automatic feed-forward compensation
Pulse-by-pulse current limiting
Enhanced load response characteristics
Undervoltage lock-out with hysteresis
Double pulse suppression
High current totem-pole output
Internally-trimmed bandgap reference
400kHz operation, guaranteed min
PIN CONFIGURATIONS
N Package
D Package
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
14
13
12
11
10
9
COMP
NC
COMP
VFB
ISENSE
RT/CT
VFB
ISENSE
RT/CT
NC
NC
VREF
VCC
OUTPUT
GROUND
NC
VREF
VCC
OUTPUT
GROUND
VC
POWER GROUND
TOP VIEW
TOP VIEW
APPLICATIONS
Off-line switched mode power supplies
DC-to-DC converters UC3842
BLOCK DIAGRAM
NOTE:
Pin numbers in parentheses refer to the D package.
(12)7
(9)5
(7)4
(3)2
(1)1
(5)3
7(11)
8(14)
6(10)
5(8)
GND
COMP
CURRENT
SENSE
CURRENT
SENSE
COMPARATOR
PWM
LATCH
INTERNAL
BIAS
5V
REF
UVLO
34V
16V
OSC
ERROR
AMP
+
2R
R
1V
2.5V
5.0V
50mA
OUTPUT
6V
VREF
VCC
VFB
S/R
RT/CT
S
R


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